/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          https://www.mrpt.org/                         |
   |                                                                        |
   | Copyright (c) 2005-2021, Individual contributors, see AUTHORS file     |
   | See: https://www.mrpt.org/Authors - All rights reserved.               |
   | Released under BSD License. See: https://www.mrpt.org/License          |
   +------------------------------------------------------------------------+ */
#pragma once

#include <mrpt/math/CMatrixDynamic.h>
#include <mrpt/poses/CPoseOrPoint.h>

namespace mrpt::poses
{
/** A base class for representing a point in 2D or 3D.
 *   For more information refer to the <a
 * href="http://www.mrpt.org/2D_3D_Geometry">2D/3D Geometry tutorial</a> online.
 * \note This class is based on the CRTP design pattern
 * \sa CPoseOrPoint, CPose
 * \ingroup poses_grp
 */
template <class DERIVEDCLASS, std::size_t DIM>
class CPoint : public CPoseOrPoint<DERIVEDCLASS, DIM>
{
	DERIVEDCLASS& derived() { return *static_cast<DERIVEDCLASS*>(this); }
	const DERIVEDCLASS& derived() const
	{
		return *static_cast<const DERIVEDCLASS*>(this);
	}

   public:
	/** @name Methods common to all 2D or 3D points
		@{ */

	/** Scalar addition of all coordinates.
	 * This is diferent from poses/point composition, which is implemented as
	 * "+" operators in classes derived from "CPose"
	 */
	template <class OTHERCLASS>
	inline void AddComponents(const OTHERCLASS& b)
	{
		const int dims = std::min(
			size_t(DERIVEDCLASS::static_size),
			size_t(OTHERCLASS::is3DPoseOrPoint() ? 3 : 2));
		for (int i = 0; i < dims; i++)
			derived().m_coords[i] +=
				static_cast<const OTHERCLASS*>(&b)->m_coords[i];
	}

	/** Scalar multiplication. */
	inline void operator*=(const double s)
	{
		for (int i = 0; i < DERIVEDCLASS::static_size; i++)
			derived().m_coords[i] *= s;
	}

	/** Returns the corresponding 4x4 homogeneous transformation matrix for the
	 * point(translation) or pose (translation+orientation).
	 * \sa getInverseHomogeneousMatrix
	 */
	template <class MATRIX44>
	void getHomogeneousMatrix(MATRIX44& out_HM) const
	{
		out_HM.setIdentity(4);
		out_HM(0, 3) = static_cast<const DERIVEDCLASS*>(this)->x();
		out_HM(1, 3) = static_cast<const DERIVEDCLASS*>(this)->y();
		if (DERIVEDCLASS::is3DPoseOrPoint())
			out_HM(2, 3) = static_cast<const DERIVEDCLASS*>(this)->m_coords[2];
	}

	/** Returns a human-readable textual representation of the object (eg:
	 * "[0.02 1.04]" )
	 * \sa fromString
	 */
	void asString(std::string& s) const;
	inline std::string asString() const
	{
		std::string s;
		asString(s);
		return s;
	}

	/** Set the current object value from a string generated by 'asString' (eg:
	 * "[0.02 1.04]" )
	 * \sa asString
	 * \exception std::exception On invalid format
	 */
	void fromString(const std::string& s);

	inline double operator[](unsigned int i) const
	{
		return static_cast<const DERIVEDCLASS*>(this)->m_coords[i];
	}
	inline double& operator[](unsigned int i) { return derived().m_coords[i]; }
	/** @} */

};	// End of class def.

/** Used by STL algorithms */
template <class DERIVEDCLASS, std::size_t DIM>
bool operator<(
	const CPoint<DERIVEDCLASS, DIM>& a, const CPoint<DERIVEDCLASS, DIM>& b)
{
	if (a.x() < b.x()) return true;
	else
	{
		if (!a.is3DPoseOrPoint()) return a.y() < b.y();
		else if (a.y() < b.y())
			return true;
		else
			return a[2] < b[2];
	}
}

template <class DERIVEDCLASS, std::size_t DIM>
bool operator==(
	const CPoint<DERIVEDCLASS, DIM>& p1, const CPoint<DERIVEDCLASS, DIM>& p2)
{
	for (int i = 0; i < DERIVEDCLASS::static_size; i++)
		if (p1[i] != p2[i]) return false;  //-V550
	return true;
}

template <class DERIVEDCLASS, std::size_t DIM>
bool operator!=(
	const CPoint<DERIVEDCLASS, DIM>& p1, const CPoint<DERIVEDCLASS, DIM>& p2)
{
	for (int i = 0; i < DERIVEDCLASS::static_size; i++)
		if (p1[i] != p2[i]) return true;  //-V550
	return false;
}
}  // namespace mrpt::poses
